Introduction to FORCES. When you ride a bike, your foot PUSHES against the pedal. The push makes the...
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Transcript of Introduction to FORCES. When you ride a bike, your foot PUSHES against the pedal. The push makes the...
![Page 1: Introduction to FORCES. When you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move. When you drop something,](https://reader035.fdocuments.us/reader035/viewer/2022062320/56649f505503460f94c7219a/html5/thumbnails/1.jpg)
Introduction to
FORCES
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FORCESWhen you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move.
When you drop something, it is PULLED to the ground by gravity.
A FORCE is a PUSH or PULL in a particular DIRECTION.
![Page 3: Introduction to FORCES. When you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move. When you drop something,](https://reader035.fdocuments.us/reader035/viewer/2022062320/56649f505503460f94c7219a/html5/thumbnails/3.jpg)
Forces can affect motion in the following ways: They can make objects:
i) START MOVING
ii) MOVE FASTER
iii) MOVE SLOWER
iv) STOP MOVING
v) CHANGE DIRECTION
vi) CHANGE SHAPE
FORCESFORCES AFFECT HOW OBJECTS MOVE.
BIG SCIENCE
IDEA
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FORCESIdentify each picture as a PUSH or a PULL. Is the force causing a change in speed or direction or both?
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FORCESSince forces cause changes in SPEED or DIRECTION of an object, we can say that forces change VELOCITY, so….
Forces cause ACCELERATION.
![Page 6: Introduction to FORCES. When you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move. When you drop something,](https://reader035.fdocuments.us/reader035/viewer/2022062320/56649f505503460f94c7219a/html5/thumbnails/6.jpg)
FORCESMore than one force can act on an object at one time. What happens to the object when forces act depends on 2 things:
1) Strength of the Forces
2) Direction of the Forces
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FORCESWhen 2 or more forces act on an object, the forces combine to form a net force.
or OPPOSE each other.
Forces may WORK TOGETHER
![Page 8: Introduction to FORCES. When you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move. When you drop something,](https://reader035.fdocuments.us/reader035/viewer/2022062320/56649f505503460f94c7219a/html5/thumbnails/8.jpg)
FORCESIf the forces cancel each other out, and do not cause the object to move, the forces
are said to be BALANCED.
If the forces don’t cancel each other out – 1 force is stronger than the others – the forces
are UNBALANCED and will cause a CHANGE IN MOTION.
![Page 9: Introduction to FORCES. When you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move. When you drop something,](https://reader035.fdocuments.us/reader035/viewer/2022062320/56649f505503460f94c7219a/html5/thumbnails/9.jpg)
MEASURING FORCE
The strength of a force is measured in NEWTONS.
The symbol is (N).
We use a SPRING SCALE to measure force.
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MEASURING FORCE
- Always “zero” your balance before use.
- Pull gently and with constant force.
-Practice using your spring scale to drag items across your desk.
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COMBINING FORCES
Two forces in the same direction can add together to produce a larger net force.
5 N
right
5 N
right
+ =
10 N
right
![Page 12: Introduction to FORCES. When you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move. When you drop something,](https://reader035.fdocuments.us/reader035/viewer/2022062320/56649f505503460f94c7219a/html5/thumbnails/12.jpg)
COMBINING FORCES
Two forces in opposite directions can subtract to produce a smaller net force in the direction of the larger force.
5 N right
10 N left
- =
5 N left
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COMBINING FORCES
Two forces may cancel each other out (if equal and opposite) to produce NO NET FORCE.
5 N right
- =
5 N left
0 N
(No Net Force)
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Circle the best answer:
1) The forces shown above are PUSHING / PULLING forces.
2) The forces shown above are WORKING TOGETHER / OPPOSITE FORCES.
3) The forces shown above are EQUAL / NOT EQUAL.
4) The forces DO / DO NOT balance each other.
5) The net force is 1000 N TO THE RIGHT / 1000 N TO THE LEFT / ZERO.
6) There IS / IS NO motion.
![Page 15: Introduction to FORCES. When you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move. When you drop something,](https://reader035.fdocuments.us/reader035/viewer/2022062320/56649f505503460f94c7219a/html5/thumbnails/15.jpg)
Circle the best answer:
7) The forces shown are PULLING / PUSHING forces.
8) The forces shown are WORKING TOGETHER / OPPOSITE FORCES.
9) The forces shown are EQUAL / NOT EQUAL.
10) The forces DO / DO NOT balance each other.
11) The stronger force is pulling RIGHT / LEFT.
12) Motion is the to the RIGHT / LEFT.
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13) Two movers are trying to move a heavy box. One mover pushes to the right with a force of 150 N. The other mover pushes to the left with a force of 200 N.
a) Draw & label the forces on the diagram.
b) What is the net force? 50 N LEFT
c) Will the box move? YES
d) If yes, in what direction? LEFT
150 N 200 N
50 N NET FORCE
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14) Two movers are trying to move a heavy chair. One mover PULLS to the left with a force of 200 N. The other mover PUSHES to the left with a force of 200 N.
a) Draw & label the forces on the diagram.
b) What is the net force?
400 N LEFT
c) Will the chair move?
YES
d) If yes, in what direction?
LEFT
200 N 200 N
400 N NET FORCE
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15) Four children are fighting over the same toy. Mike is pulling North with a 50 N force, Justin is pulling East with a 40 N force, Chantal is pulling South with a 50 N force, and Tykera is pulling West a 30 N force.
a) Draw & label the forces on the diagram.
b) Is there a net force on the toy?
YES = 10 N EAST
c) In which direction will the toy move?
EAST
d) Who gets the toy?
JUSTIN
50 N
50 N
30 N 40 N
10 N
Net Force
MIKE
JUSTIN
CHANTAL
TYKERA